63924521 has 4 divisors (see below), whose sum is σ = 66703872. Its totient is φ = 61145172.

The previous prime is 63924503. The next prime is 63924533. The reversal of 63924521 is 12542936.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63924521 - 2¹⁴ = 63908137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63924221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1389641 + ... + 1389686.

It is an arithmetic number, because the mean of its divisors is an integer number (16675968).

Almost surely, 2^63924521 is an apocalyptic number.

It is an amenable number.

63924521 is a deficient number, since it is larger than the sum of its proper divisors (2779351).

63924521 is a wasteful number, since it uses less digits than its factorization.

63924521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779350.

The product of its digits is 12960, while the sum is 32.

The square root of 63924521 is about 7995.2811707907. The cubic root of 63924521 is about 399.8426902255.

The spelling of 63924521 in words is "sixty-three million, nine hundred twenty-four thousand, five hundred twenty-one".